Table variable

table variable will store in temp db only. when the tempdb space is
full then it will create on memory.
It is not always true that table variable will create in memory.
see the test bellow
DECLARE @tablevar TABLE(col INT);
INSERT INTO @tablevar VALUES(1);
SELECT TABLE_NAME
FROM tempdb.INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE '%#%';

SqlServer Supported OS

Sqlserver 2008 is supported on 32 bit and 64 bit operating System.

SqlServer 32 bit can install on 32 bit and 64 bit version of windows on windows (wow).

SqlServer 2008 Cannot be installed on windows Server 20008 Server Core .Windows server 2008 Server core does not support .net frame work. SinceSever relies on .net  frame work.

SQL ServerHistory
 

Version	Year	Release Name	Codename
1.0 (OS/2)	1989	SQL Server 1.0 (16bit)	-
1.1 (OS/2)	1991	SQL Server 1.1 (16bit)	-
4.21 (WinNT)	1993	SQL Server 4.21	SQLNT
6.0	1995	SQL Server 6.0	SQL95
6.5	1996	SQL Server 6.5	Hydra
7.0	1998	SQL Server 7.0	Sphinx
-	1999	SQL Server 7.0 OLAP Tools	Plato
8.0	2000	SQL Server 2000	Shiloh
8.0	2003	SQL Server 2000 64-bit Edition	Liberty
9.0	2005	SQL Server 2005	Yukon
10.0	2008	SQL Server 2008	Katmai
10.25	2010	SQL Azure	Matrix (aka CloudDB)
10.5	2010	SQL Server 2008 R2	Kilimanjaro (aka KJ)
11.0	2012	SQL Server 2012	Denali